继承时报错了

小甲鱼的铁粉

Student是基类，Menu类要继承Student

这个是Student.java文件的代码

1. package essential;
   
2. public class Student {
   
3.        
   
4.         public String studentNumber;
   
5.         public String name;
   
6.         public String major;
   
7.        
   
8.         public int math;
   
9.         public int computer;
   
10.         public int english;
    
11.         public int sum;
    
12.        
    
13.         public Student (String _studentNumber, String _name, String _major, int _math, int _computer, int _english){
    
14.                 studentNumber = _studentNumber;
    
15.                 name = _name;
    
16.                 major = _major;
    
17.                
    
18.                 math = _math;
    
19.                 computer = _computer;
    
20.                 english = _english;
    
21.         }
    
22. }
    

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这个是Menu.java文件的代码，红色的是报错的部分，public class Menu extends Student报错为：没有为缺省构造函数定义隐式超构造函数 Student（）。必须定义显式构造函数

1. package essential;
   
2. import java.util.Scanner;
   
3. public class Menu extends Student{
   
4. 
   
5.         public static void main(String[] args) {
   
6.                 Scanner in = new Scanner(System.in);
   
7.                 Student []stu = new Student[5];
   
8.                
   
9.                 stu[0] = new Student("Jack","软工","20183101",80,90,85);
   
10.                 stu[1] = new Student("Rose","大数据","20183102",99,93,90);
    
11.                 stu[2] = new Student("John","网安全","20183103",87,70,74);
    
12.                 stu[3] = new Student("Andi","网工程","20183104",67,66,68);
    
13.                 stu[4] = new Student("Mike","物联网","20183105",56,90,55);
    
14.                
    
15.         }
    
16. }
    

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这个该怎么解决呢

小甲鱼的铁粉

如果加上构造函数，改为这样，就找不到Student了

1. package essential;
   
2. import java.util.Scanner;
   
3. public class Menu extends Student {
   
4. 
   
5.         public Menu(String _studentNumber, String _name, String _major, int _math, int _computer, int _english) {
   
6.                 super(_studentNumber, _name, _major, _math, _computer, _english);
   
7.                 // TODO 自动生成的构造函数存根
   
8.         }
   
9. 
   
10.         public static void main(String[] args) {
    
11.                 Scanner in = new Scanner(System.in);
    
12.                 Student []stu = new Student[5];
    
13.                
    
14.                 stu[0] = new Student("Jack","软工","20183101",80,90,85);
    
15.                 stu[1] = new Student("Rose","大数据","20183102",99,93,90);
    
16.                 stu[2] = new Student("John","网安全","20183103",87,70,74);
    
17.                 stu[3] = new Student("Andi","网工程","20183104",67,66,68);
    
18.                 stu[4] = new Student("Mike","物联网","20183105",56,90,55);
    
19.                
    
20.         }
    
21. }
    

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报错为public class Menu extends Student {
                          ^
  符号: 类 Student
Menu.java:12: 错误: 找不到符号
                Student []stu = new Student[5];
                ^
  符号:   类 Student
  位置: 类 Menu
Menu.java:12: 错误: 找不到符号
                Student []stu = new Student[5];

baige

Menu类写个构造函数，用super(Student构造函数需要的参数)调用student类的构造函数

小甲鱼的铁粉

baige 发表于 2020-12-22 14:50
Menu类写个构造函数，用super(Student构造函数需要的参数)调用student类的构造函数

不好意思，之前忘记修改帖子了，是环境变量的问题，已经解决了